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Add conformance tests around type decaying #530

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ca74f70
Add conformance tests around type decaying
l46kok Sep 10, 2026
d4c6ed1
Add more tests
l46kok Sep 11, 2026
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147 changes: 147 additions & 0 deletions tests/simple/testdata/type_deduction.textproto
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Original file line number Diff line number Diff line change
Expand Up @@ -951,3 +951,150 @@ section {
}
}
}

section {
name: "type_decay"
description: "Tests for type decay / least-upper-bound generalization of type values."
test {
name: "type_list_decay"
expr: "[int, bool, double]"
typed_result {
result {
list_value {
values {
type_value: "int"
}
values {
type_value: "bool"
}
values {
type_value: "double"
}
}
}
deduced_type {
list_type {
elem_type {
type {
dyn {}
}
}
}
}
}
}
test {
name: "type_ternary_decay"
expr: "true ? type(1) : type(1u)"
typed_result {
result {
type_value: "int"
}
deduced_type {
type {
dyn {}
}
}
}
}
test {
name: "type_free_param_list_decay"
description: "Type decay for list literal containing a free type parameter in a type value and a concrete type."
expr: "[type([]), int]"
typed_result {
result {
list_value {
values {
type_value: "list"
}
values {
type_value: "int"
}
}
}
deduced_type {
list_type {
elem_type {
dyn {}
}
}
}
}
}
test {
name: "type_nested_list_decay"
description: "Type decay for nested list literal with differing type values."
expr: "[[type(1)], [type(1u)]]"
typed_result {
result {
list_value {
values {
list_value {
values {
type_value: "int"
}
}
}
values {
list_value {
values {
type_value: "uint"
}
}
}
}
}
deduced_type {
list_type {
elem_type {
list_type {
elem_type {
type {
dyn {}
}
}
}
}
}
}
}
}
test {
name: "type_free_param_list_concat"
description: "Type deduction for concatenated lists containing free type parameters in type values."
expr: "([] + [[type(1)]]) + [[type([])]]"
typed_result {
result {
list_value {
values {
list_value {
values {
type_value: "int"
}
}
}
values {
list_value {
values {
type_value: "list"
}
}
}
}
}
deduced_type {

@l46kok l46kok Sep 11, 2026

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@jnthntatum I believe this is the desired outcome, let me know what you think

@TristonianJones TristonianJones Sep 11, 2026

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It's debatable whether the value would be list(list(type(int))), only because the empty list should have a free type parameter that gloms into the very specific element type on the right

list_type {
elem_type {
list_type {
elem_type {
type {
dyn {}
}
}
}
}
}
}
}
}
}
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